/*
 * Copyright 2012-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.springcloud.gray.bean.convert;

import java.util.Collections;
import java.util.Set;

import cn.springcloud.gray.bean.domain.DataSize;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.GenericConverter;

/**
 * {@link Converter} to convert from a {@link Number} to a {@link DataSize}.
 *
 * @author Stephane Nicoll
 * @see DataSizeUnit
 */
final class NumberToDataSizeConverter implements GenericConverter {

    private final StringToDataSizeConverter delegate = new StringToDataSizeConverter();

    @Override
    public Set<ConvertiblePair> getConvertibleTypes() {
        return Collections.singleton(new ConvertiblePair(Number.class, DataSize.class));
    }

    @Override
    public Object convert(Object source, TypeDescriptor sourceType,
                          TypeDescriptor targetType) {
        return this.delegate.convert((source != null) ? source.toString() : null,
                TypeDescriptor.valueOf(String.class), targetType);
    }

}
